make[1]: Entering directory `/home/ungov/falktx/Carla/source/backend/engine'
make[1]: Nothing to be done for `all'.
make[1]: Leaving directory `/home/ungov/falktx/Carla/source/backend/engine'
make[1]: Entering directory `/home/ungov/falktx/Carla/source/backend/plugin'
make[1]: Nothing to be done for `all'.
make[1]: Leaving directory `/home/ungov/falktx/Carla/source/backend/plugin'
make[1]: Entering directory `/home/ungov/falktx/Carla/source/jackbridge'
make[1]: Nothing to be done for `all'.
make[1]: Leaving directory `/home/ungov/falktx/Carla/source/jackbridge'
make[1]: Entering directory `/home/ungov/falktx/Carla/source/native-plugins'
Compiling zynaddsubfx-ui.cpp
In file included from zynaddsubfx/UI/guimain.cpp:68:0,
                 from zynaddsubfx-ui.cpp:104:
zynaddsubfx/UI/Fl_Osc_Tree.H:4:24: fatal error: FL/Fl_Tree.H: No such file or directory
 #include <FL/Fl_Tree.H>
                        ^
compilation terminated.
make[1]: *** [../../build/native-plugins/Release/zynaddsubfx-ui.cpp.o] Error 1
make[1]: Leaving directory `/home/ungov/falktx/Carla/source/native-plugins'
make: *** [/home/ungov/falktx/Carla/build/modules/Release/native-plugins.a] Error 2